In my views this is simply too fast as is. Your Palace should expand it's first ring quickly, but after that I think we need to eliminate most/all culture until the colonies have gone beyond suriviving and into expanding.
Without a python guy on board I think we'll be stuck with using the culture mechanism for this expansion, but we could call it something else.
Without a python guy on board I think we'll be stuck with using the culture mechanism for this expansion, but we could call it something else.